[SPARK-26010][R] fix vignette eval with Java 11

## What changes were proposed in this pull request?

changes in vignette only to disable eval

## How was this patch tested?

Jenkins

Author: Felix Cheung <[email protected]>

Closes apache#23007 from felixcheung/rjavavervig.

(cherry picked from commit 88c8262)
Signed-off-by: Felix Cheung <[email protected]>

Author: felixcheung

R/pkg/vignettes/sparkr-vignettes.Rmd

@@ -57,6 +57,20 @@ First, let's load and attach the package.
 library(SparkR)
 ```
 
+```{r, include=FALSE}
+# disable eval if java version not supported
+override_eval <- tryCatch(!is.numeric(SparkR:::checkJavaVersion()),
+          error = function(e) { TRUE },
+          warning = function(e) { TRUE })
+
+if (override_eval) {
+  opts_hooks$set(eval = function(options) {
+    options$eval = FALSE
+    options
+  })
+}
+```
+
 `SparkSession` is the entry point into SparkR which connects your R program to a Spark cluster. You can create a `SparkSession` using `sparkR.session` and pass in options such as the application name, any Spark packages depended on, etc.
 
 We use default settings in which it runs in local mode. It auto downloads Spark package in the background if no previous installation is found. For more details about setup, see [Spark Session](#SetupSparkSession).